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. 1996 Apr 15;24(8):1547–1553. doi: 10.1093/nar/24.8.1547

Identification of members of several homeobox genes in a planarian using a ligation-mediated polymerase chain reaction technique.

G Balavoine 1
PMCID: PMC145808  PMID: 8628690

Abstract

I have used a novel single-sided specific polymerase chain reaction (PCR) strategy inspired by ligation-mediated PCR to clone fragments of divergent homeobox genes from a flatworm, the planarian Polycelis nigra. Eight homeobox-containing fragments were amplified, belonging to the Hox, msh, NK-1 and NK-2 classes. Together with the results obtained from several genomes of platyhelminths, my screening shows the presence of the same array of homeodomain developmental regulators in planarians, traditionally regarded as primitive metazoans in terms of body plan, as in coelomate organisms. However, the presence of a Ubx/abd-A homolog may indicate that platyhelminths are more closely related to protostomes than to deuterostomes and supports the idea that flatworms have inherited an elaborate HOX cluster (seven or eight genes) from their ancestor. Likely homologs of the fly genes tinman, bagpipe and S59 suggest that the mesoderm might be patterned by the same genes in all bilaterally symmetrical animals. Finally, a msh-like gene, a family known to be involved in inductive mechanisms in vertebrates, has been found. These results support the hypothesis that the tremendous diversity of metazoan body plans is specified by a largely conserved array of homeobox-containing developmental genes.

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Selected References

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